Oracle Error ORA-01463: cannot modify column datatype with current constraint(s)

Oracle Error Message

ORA-01463: cannot modify column datatype with current constraint(s)

Reason for the Error

An attempt was made to modify the datatype of column which has referential constraints; or has check constraints which only allows changing the datatype from CHAR to VARCHAR or vise versa.

Solution

Remove the constraint(s) or do not perform the offending operation.